Most content management systems and comment platforms allow you to turn on comment moderation before a comment goes live.
As an independent dentist, you should do your best to listen to the comments and provide a solution if you can. If it feels necessary, outline a few points where you feel you already address the problem. Explain that you appreciate their feedback, and that you take it seriously.
Most of all, don’t take it personally. Always thank the writer -–even when it’s been a negative comment.
http://contentmarketinginstitute.com/2016/07/content-backfires-negative-feedback/
Loran Simon